Printing-machine



3 Sheets-Sheet.- 1.

(No Model.)

C.B.GOTTRBLL. PRINTING MACHINE.

Patented sept. 29, 1885.

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(No Model.) 3 Sheets-Sheet 2.

C. B. COTTRELL.

PRINTING MACHINE. No. 327,243. Patented Sept. l29, 1885.

(No Model.) 3 Sheets-Sheet 3.

G. B. GOTTRELL.

PRINTING MACHINE.

No. 327.243." Patented sept..29, 1885.

frze eam- I @www Q O UNITED STATES PATENT OFFICE.

CALVER'I B. COTTRELL, OF STONINGTON, CONNECTICUT.

PRINTING-MACHINE.

' SPECIFICATION forming part of Letters PatentNo. 327,243, datedSeptember 29, 1885.

Application filed April 17, 1884.

chines, of which the following is a specification.

My invention is more particularly applicable to lithographie presses;and it relates to stop-cylinder presses in which the cylinder carries asegment gear and the bed a rack, whereby the cylinder during printing isgeared with the bed, but which permits the bed to move back or returnafter printing, leaving the cylinder stationary. v

Owing to the difficulty ofengaging the segment-gear of the cylinder withthe bed-rack when the bed is moving at a high speed, and of stopping thecylinder if its segment runs out of the bed-rack when the bed is movingat a high speed, the beds of stop-cylinder presses have largelyheretofore been driven by cranks,because the crank gives agraduallydecreasing and then a gradually-increasing speed to the bed atthe end of its movement. These crank presses are, however,objectionable, because the method of operating the cylinder hasnecessitated a comparatively slow performance of work by the press, andin my Letters Patent No. 177,808, dated May 23, 1876, the stop-cylinderpress was greatly improved by giving the bed a uniform speed oimovement, and by attaching to the cylindera short segment-gearindependent of the segment with which t-he bed-rack engages, andemploying in connection therewith a sectorgear, which by a suitable camis broughtinto engagement with the sector-gear as the cylinder isdisengaged from the bed, so as to gradally take up the momentum of thecylinder and bring it to a full stop, and which by another suitable camis moved in an opposite direction to overcome the inertia of thecylinder and start it forward with such a graduallyaccelerated movementthat it andthe bed shall have a common speed when its rack and thecylinder-segment are brought to their point of engagement.

In order to secure a proper action of the mechanism for stopping andstarting the cylinder just described, a careful adjustment of (Nomodel.)

the sector-gearwhcreby the cylinder is turned in stopping and starting,and of the cams whereby said sector is operated, was necessary, and eventhen there was liable, especially in running very fast, to be a thump orknock at the time the cylinder is let go by the bed and taken by thecam-actuated sector-gear, and vice versa.

An important object of my present-invention is to obtain a stillsmoother operation of the cylinder, whereby the press may be safely runat a higher speed than has before been attainable in stop -cylinderpresses, and, furthermore, to enable the cylinder, while receiving itsentire movementfrom the bed, to beturned considerably more thanacomplete revolution during the forward movement of the bed, so

that the printed sheet may be delivered from the front of the cylinder,the time taken by such rotation of the cylinder to deliver beingutilized in a lithographie press to give the bed'a longer movement,which will carry its form in the forward or printing stroke entirelybeyond the cylinder and under the wettingrollers, located at theopposite side of the cylinder `from the color or inkingrollers.

To these ends my invention consists in novel combinations of parts,which are hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is daside elevation of such partsof apress as are necessary to illustrate my invention, the parts beingshown in the positions they occupy at the instant the bed commences itsmovement to print. Fig. 2 is a transverse vertical section of said partson the dotted line x x, Fig. l, looking toward the cylinder. Fig. 8 is avertical section and side elevation of certain parts of the press on thedotted line y y, Fig. 2; and Fig. 4 is a sectional view on the plane ofthe dotted line e' z, Fig. 3.

Similar letters of reference designate corresponding parts in all thegures.

A A designate the side frames of the press, which are erected on thebed-plate B, and C designates the cylinder, which is j ournaled insuitable bearings, a, in the upper side frames or cylinder-frames, A.

D designates the bed, which is capable of sliding on suitable bearers,b, secured upon cross pieces or stretchers A2, connecting the IOO sideframes, A A, and D designates the form, which in this example of myinvention consists of a lithographie stone.

Attached to the under side of the bed D is a rack, c, with which engagesa pinion or wheel, d. This pinion or wheel d is mounted on a shaft, d,in which is a knuckle or universal joint or coupling, d2, as best shownin Fig. 2, and which is supported at one end in a bearing in the sideframe, A, and adjacent to the Wheel d in a bearing, d3, wherein it canrise and fall a sufficient distance to allow it to engage with the upperor lower side of the rack c on the lower side of the bed. The shaft dreceives a motion continuously in one direct-ion through the wheel andpinion e e from a shaft, E, on which are placed the drivingpulleys e2e3. v(Shown in Fig. 2.) This mechanism for drivingthe bed is shown in myaforesaid Letters Patent, and is a well-known movement for transforminguniform rotary motion into uniform reciprocating motion, the shaftengaging with the under or upper side of the rack c to move the bed inone or other direction at uniform or nearly uniform speed. The shaft Etherefore constitutes the driving-shaft of the machine, and imparts thedesired uniform motion to the bed, and the entire movement of thecylinder is produced by suitable gearing operated by the bed, and whichI shall now describe.

ln one of the side frames Ais j ournaled a short shaft, f, having fixedon one end a pinion, f,

which engages with a rack, f2, on the under side of the bed and receivesa rotary motion alternately in opposite directions as the bed isreciprocated, and having fixed on the other or outer end a similarpinion, f3, which gears into a large spur-wheel, F, fast on a shaft, F.This shaft is journaled at one end in one of the side frames A, and atthe other end in an outside or supplemental frame or standard, A3, andthe wheel F has such a circumference that it will make a complete turnat each forward or backward movement of they bed. Consequently the shaftF is not rotated continuously in one direction, but has irnparted to ita reciprocating rotary motion, moving in each direction a complete ornearly complete turn. Y

G designates a second shaft, which is likewise journaled in the frames AA3, and on which is fixed a spur-wheel, G, gearing into a spur-wheel,G2, on the shaft of the cylinder y C. The wheel G2 is fast on thecylinder-shaft,

and consequently it will be understood that whenever the shaft G isturned the cylinder is also turned.

On the shaft F are two wheels, H I, which are both fast thereon, andwhich gear into two other wheels, H I, on the shaft G. The wheels H Iare loose on the shaft G, and are severally connected therewith orlocked thereto at the desired times by a clutch-piece, J, capable ofsliding on the shaft to cause it to engage with one or other of the saidwheels, or to bring it to a position midway between them, in order toleave both wheels free. This clutch-piece is connected with the shaft Gin a well -understood manner by a feather or spline, and is operated bya lever, K K', fulcrumed at g to a bracket, g', projecting from theouter frame or standard, A2. The upper arm, K, of the said lever isforked to embrace the clutch-piece J, and the lower arm, K', thereof isconnected with a rod, K2, as best shown in Fig. 2.

L designates a shaft which extends lengthwise of the press, and which isdriven by bevel gears g2 g3 from the driving-shaft E.

Upon the shaft L is a cam, L', the form and purpose of which will behereinafter described, and the rod K2 is forked to straddle the shaft,and carries a bowl or roller, h, which engages with a groove in saidcam.

The wheels H H are cam shaped spurwheels, the forms of which are bestshown in Fig. 3, and the wheels I I are not cam-shaped, but have a planeuniform periphery, the wheel I being smaller than the wheel I.

During printing the cylinder C is geared with the bed D byspur-segmentsi on the cylinder engaging with racksj on the top of thebed, and, as shown in Fig. 2, one rack j is directly above and formed inthe same piece with the rack f2.

The form of the cam L is best shown in Fig. 4. In its side is a groovewhich comprises three concentric portions, k la k2. of different radii,and th ree offsets, la* The cam turns in the direction indicated by thearrows thereon in Figs. 2 and 4, and produces the following movements ofthe clutch-piece J: So longr as the bowl or roller h is in thelongerconcentric groove portion k the clutch-piece is held in engagement withthe wheel H', as shown in the drawings; but by the rotation of the camthe offset k* acts upon the said bowl or roller h, and directs it intothe second concentric portion, k', which is of shortest radius, andthereby throws the clutch-piece J out of engagement with the wheel H andacross into the wheel l', where it remains during the passage of thegroove portion k over the roller h and until the offset ar'* reaches thesaid roller. The offset k**, acting on the roller h, draws theclutch-piece J out of the wheel I and intoan intermediate position outof engagement with both wheels H I, where it remains during the time theconcentric groove portion k2 traverses the roller h, and until theoffset Wwf, acting on the said roller li, throws' the clutch-piece Jagain into engagement with the wheel H, in which position it appears inthe drawings.

In front of the cylinder C,I have represented in outline inking or colorrollers l, and behind the cylinder are represented in a similar mannerwetting-rollers Z,which would not be necessary in a type-press.

At the top of the cylinder is the feed-board S, and at the front of thecylinder, opposite the feed-board, are chain-Wheels m, over which passendless chains, carrying deliverygrippers.

IOO

IIO

IZO

I have not here shown these chains fully nor the delivery-grippe'rs, asthey form no part of my present invention; but in my two applica tionsfor Letters Patent, filed, respectively,

November 26,1883, and January 28, 1884, and

'through the shaft f, pinion f3, wheel F, and

shaft F, turns the cam-shaped gear H in the direction indicated by thearrows thereon in Figs. 1 and 3, and inasmuch as the fellow camwheel His now locked by the clutch J to its shaft G said shaft will also beturned, and through the wheels G GrZ will turn the cylinder forward inthe direction ofthe arrows, Figs. 1 and 3. At the initial movement ofthe wheel H the portion :i: is coming into engagement and meshes intothe corresponding portion of the fellow wheel H', and consequently theinertia of the cylinder will be overcome very gradually, and thecylinder gradually increased in speed until at the time the bed-racks jcome to the cylinder they mesh into the segments t without shock or jar,and continue in gear therewith until printing is completed.

In the press here shown the travel of the bed is sufficient to carry itentirely beyond the cylinder and into the position shown in dotted linesat the right of the cylinder in Fig. 3. This carries the stone or form Dunder the wetting-rollers, and during the Whole forward movement of thebed the concentric groove portion 7c of the cam L has held the rollerlz, and therefore kept the clutchpiece J in constant engagement with thewheel H.

As before stated, the circumference of the wheel F is equal to thetravel of the bed D, and the wheel H, being upon the same shaft, alsomakes a single revolution at each movement of the bed, and by the timethe bed has reached the end of its movement the wheels H H are again inthe position shown in Fig. 1, and have brought the cylinder to astandstill without shock or jar.

In a front-delivery press as here shown the gearing should be soproportioned as to give the cylinder more than a complete revolution,and therefore the gearing shown is arranged to carry the receiving-edges of the cylinder beyond the position shown in Fig. 1 to the positionindicated by the dotted line 8*, or thereabout, and as the cylinder,after a comu plete turn, moves from s to s* the sheet is delivered andthe cylinder brought to a standstill at s at the time the bed terminatesits movement.

As the bed completes its movement and just before it begins its returnthe cam L by its rotation brings the offset la* against the roller h,and by acting thereon moves the clutchpiece J out of engagement with thewheel H and into engagement with the wheel I', at which time the saidroller is in the concentricportion la of smallest radius; but as soon asthe clutchpiece J is unlocked from the wheel H the bed Dy commences itsreturn movement, thereby turning the shaft F and its wheels H I in theopposite direction. The instant that the clutch-piece J engages with thewheel I the cylinder is turned back at a slow speed, because of thecomparatively small size of the wheel I and the larger size of the wheelI', and until the receiving-edge of the cylinder is brought back to theposition indicated by s in Figs. 1 and 3. The offset kw of the cam L nowacts on the roller h and draws the clutch-piece J out of engagement withthe wheel I and into an intermediate position, where it remains whilethe concentric groove portion k2 of the cam L traverses the roller h,the cylinder being left stationary to properly register the sheet uponit. As the bed completes its return movement the offset 765%* meets theroller It, and thereby throws the clutch-piece J again into engagementwith the wheel H to move the cylinder forward with its sheet, and, asbefore described, the portions of 'the wheels H H coming into geareffects the starting of the cylinder very slowly and accelerates itsspeed until at the time of the coming together of the bed-racks j andcylinder-segments i the bed and cylinder have a uniform movement.

If found necessary or desirable on highspeed presses, I may employ meansto clamp the cylinder at the time of reversing the bed, and also at thetime of unlocking the cylinder when it is brought to a posit-ion toreceive the fresh sheet from the feed-board.

In a stop-cylinder press in which it is not important to run thecylinder over to facilitate the delivery ofthe printed sheet the bedwill run by77 the cylinder only about four to six inches, and in thistime the cylinder will run down to slow and stop, which will just placethe receiving-edge of the cylinder in the proper position for feedingthe fresh sheet, and by unlocking the cylinder at the point of reversalof the bed,or just before, the cylinder will not be disturbed. In thiscase the two concentric spur-wheels I I would not be required, and theclutch-piece J would simply be actuated to lock into and unlock from thewheel H.

By my invention I operate the cylinder by gears which are always inmesh, and am thus enabled to run very rapidly and to effect theengagement of the bed and cylinder for printing without shock or jar,and also to stop and start the cylinder very gradually. I am alsoenabled to run the cylinder ahead after IOO printing to facilitate thedelivery of the printed sheet, and then return it to a receivingposition while the bed is returning and before it comples its returnmovement, thus giving ample time for registering the sheet on thecylinder.

What I claim as my invention, and desire to secure by Letters Patent,is-

l. In a stop-cylinder printing-press, the combination, with a bed, of acylinder geared directly to the bed during printing, and gearing andintermediate mechanism connecting the bed and cylinder,substantially asdescribed, whereby the cylinder is carried past the point of taking asheet during the forward Inovement ofthe bed, in order to deliver theprinted sheet at the front of the cylinder, and is then returned to thepoint of taking the sheet and there allowed to dwell until the neXtforward movement of the bed, substantially as and for the purpose hereindescribed.

2. In a stop-cylinder printing-press, the combination, with a bed, of acylinder which is geared directly with the bed during printing, andcam-shaped gear-wheels deriving motion from the bed and serving to startthe cylinder gradually and accelerate its speed, so that it and the bedwill have a uniform motion at the time of coming into gear, and alsoserving to bring the cylinder gradually to a stop, substantially as andfor the purpose herein described.

3. In a stop cylinder printing-press, the combination, witha bed, of acylinder geared directly with the bed during printing, a shaft gearingwith the bed and receiving a recipro- 'eating rotary motion therefrom,an intermediate shaft geared with the cylinder, camnshaped gear-wheelsconnecting said shafts, the

Wheel upon the intermediate shaft being loose, and a cam-actuatedclutch-piece whereby said loose wheel may be locked to its shaft duringthe forward movement of the bed and left unlocked during the returnmovement of the bed, substantially as and for the purpose hereindescribed.

4. In a stop cylinder printingpress, the combination, with a bed, of acylinder having a gear-segment and a rack on the bed whereby thecylinder is geared directly with the bed during printing, and cam-shapedgear wheels serving to start the cylinder gradually and accelerate itsspeed, so that the bed and cylinder will have a uniform speed at thetime of the rack on the bed coming into gear With the segment on thecylinder, and also serving to gradually stop the cylinder after thebed-rack has run out of gear with the cylinder-segment, substantially asand for the purpose herein described.

5. In a stop -cylinder printing-press, the combination, with a bed and acylinder, of cam-shaped gear-wheels, whereby the cylinder is startedgradually at the commencement of its movement and carried past aposition to take the sheet and there stopped, other gear-Wheels, wherebythe cylinder is reversed and moved back to a position to takethe sheet,and a cam-actuated clutch-piece, whereby said cylinder may bealternately connected with the cam-shaped gears and the reversinggears,substantially as and for the purpose herein described.

6. The combination, with the bed D and cylinder C, provided with therack and segmentj 11, for engagement during printing', of the shaft G,geared With the cylinder, the shaft F, geared with the bed and having areciproeating rotary motion, the cam-shaped Wheel H on shaft F', thecam-shaped wheel H loose on the shaft G, the clutch-piece J, and the camL and connections, substantially such as described, for controlling theclutch-piece J, substantially as set forth.

7. The combination, with the bed D and cylinder C, provided with therack and seg mentj t', for engagement during printing, of the shaft G,geared with the cylinder, and the Wheels H I, loose thereon, the shaftF, geared with the bed and having a reciprocating rotary motion, thewheels H I, fast on the shaft F, the clutch-piece J. and the cam L', andconnections, substantially such as described, for controlling saidclutch-piece, substantially as set forth.

C. B. COTTRELL.

W'itnesses FREDK. HAYNns, C. HALL.

